Very high potassium (VHK) basalt - Complications in mare basalt petrogenesis

Details Very high potassium (VHK) basalt - Complications in mare basalt petrogenesis Very high potassium (VHK) basalt - Complications in mare basalt petrogenesis

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...16....3s&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

9

Basalt, Geochemistry, Lunar Composition, Lunar Maria, Petrography, Potassium, Apollo 14 Flight, Feldspars, Glass, Iron, Olivine, Pyroxenes, Moon, Vhk Basalt, Potassium, Maria, Petrogenesis, Apollo 14, Rubidium, Samples, Lunar, Concentration, Barium, Comparisons, Feldspar, Glass, Olivine, Minerology, Isotopic Ratios, Strontium, Fractionation, Age, Formation, Source, Volatiles, Enrichment, Granite, Diffusion, Alkali, Trace Elements, Melts, Geochemistry, Crust, Interactions

Scientific paper

The first comprehensive report on the petrology and geochemistry of Apollo 14 VHK (Very High Potassium) basalts and their implications for lunar evolution is presented. The reported data are most consistent with the hypothesis that VHK basalts formed through the partial assimilation of granite by a normal low-Ti, high-Al mare basalt magma. Assimilation was preceded by the diffusion-controlled exchange of alkalis and Ba between basalt magma and the low-temperature melt fraction of the granite. Hypotheses involving volatile/nonvolatile fractionations or long-term enrichment of the source regions in K are inconsistent with the suprachondritic Ba/La ratios and low initial Sr-87/Sr-86 ratios of VHK basalt. An important implication of this conclusion is that granite should be a significant component of the lunar crust at the Apollo 14 site.

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